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We've had installers tell us they prefer the 4.0mm² for long rooftop runs where voltage drop matters, and it's basically the go-to for most residential systems we ship out.
The tinned copper strands handle corrosion better than bare copper in coastal areas, and the XLPE insulation keeps things stable from -40°C to 90°C — that's a pretty wide window for outdoor use, though you'll want to check the DC rating at 1500V if you're pushing high-voltage strings.
It's 600/1000V AC and 1000/1500V DC, but teh 4.0mm² cross section gives you a DC resistance of about 5.09Ω/km at 20°C, which is tighter tolerance than standard building wire for this applicaion, and the insulation resisance sits at ≥10¹⁴Ω·cm at 20°C (usually we have COAs on hand for this).
Flame retardant and halogen free, so it meet TUV and CE, but it's not designed for direct burial — that's a limitation we're upfront about, and the UV resistance is excellent for exposed runs.
Anyway, standard lengths come in 100m, 200m, 500m, or 1000m per roll, and our company can do red or black jackets, though the twin core option takes about 20 days or so for custom colors.
Most buyers go with the 100m roll for smaller setups.
